How do I track “screen on” time on Android?

Question

I\'m trying to do something (theoretically) simple with my first app, but I need some help getting started. I\'d like to build an app that tells me how long the screen on my

Answer 1

Better implement as a BroadcastReceiver:

public class ScreenTimeBroadcastReceiver extends BroadcastReceiver {

    private long startTimer;
    private long endTimer;
    private long screenOnTimeSingle;
    private long screenOnTime;
    private final long TIME_ERROR = 1000;

    public void onReceive(Context context, Intent intent) {
        Log.i(P.TAG, "ScreenTimeService onReceive");

        if(intent.getAction().equals(Intent.ACTION_SCREEN_ON)){
            startTimer = System.currentTimeMillis();
        }
        else if(intent.getAction().equals(Intent.ACTION_SCREEN_OFF)){
            endTimer = System.currentTimeMillis();
            screenOnTimeSingle = endTimer - startTimer;

            if(screenOnTimeSingle < TIME_ERROR) {
                screenOnTime += screenOnTime;
            }

        }
    }
}

You will need to register the receiver like this (in onCreate activity for example):

    screenTimeBroadcastReceiver = new ScreenTimeBroadcastReceiver();
    IntentFilter lockFilter = new IntentFilter();
    lockFilter.addAction(Intent.ACTION_SCREEN_ON);
    lockFilter.addAction(Intent.ACTION_SCREEN_OFF);
    registerReceiver(screenTimeBroadcastReceiver, lockFilter);